Miyabi married a man she met at work. She was living happily with her husband, but her stepchild, Yusei, did not open up to her and she was at a loss. She tries to get closer to her, but Yusei, who has become distrustful of women due to her past of being betrayed by her previous mother, tries to use her as a sex tool and chase her away... Miyabi continues to follow his orders in search of her family connections, but Yusei is in her class.